Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2

Abstract

Critical points that can be suppressed to zero temperature are interesting because quantum fluctuations have been shown to dramatically alter electron gas properties. Here, the metal formed by Co doping the paramagnetic insulator FeS${}_2$, Fe${}_{1-x}$Co${}_x$S${}_2$, is demonstrated to order ferromagnetically at $x>x_c=0.01\pm 0.005$ where we observe unusual transport, magnetic, and thermodynamic properties. We show that this magnetic semiconductor undergoes a percolative magnetic transition with distinct similarities to the Griffiths phase, including singular behavior at $x_c$ and zero temperature.

10 pages, 4 figures

References in corpus (3)

• An experimental and computational investigation of structure and magnetism in pyrite Co${}_{1-x}$Fe${}_x$S${}_2$: Chemical bonding and half-metallicity
• Magnetic Percolation and the Phase Diagram of the Disordered RKKY model
• Antisite effect on ferromagnetism in (Ga,Mn)As

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• Random free-fermion quantum spin chain with multi-spin interactions
• Topological Hall effect and the magnetic states of Nowotney chimney ladder compound Cr${}_{11}$Ge${}_{19}$}
• Thermoelectric transport properties of electron doped pyrite FeS2
• The effect of disorder on quantum phase transition in the double layered ruthenates (Sr1-xCax)3Ru2O7
• Monte Carlo simulations of the disordered three-color quantum Ashkin-Teller chain
• Observation of Griffiths-like phase in the quaternary Heusler compound NiFeTiSn